A soft commutation constant high frequency link DC/AC converter operating with sinusoidal output voltage

Vidor, Dalton L. R.; Perín, Adriano

doi:10.1109/pesc.1994.349670

Cited by 6 publications

(2 citation statements)

References 2 publications

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“…The bus current is the current drawn from the bus voltage . The average bus current can be shown to be (4) Note that (4) predicts that the average bus current is independent of the output voltage. The control range of the phase shift is limited to radians because the absolute value of the output current is decreased if it is taken outside of this value.…”

Section: B Dab Dc/dc Convertermentioning

confidence: 99%

A new power-factor-corrected single-transformer UPS design

Morrison

Egan

2000

IEEE Trans. on Ind. Applicat.

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Phenomenal growth in the personal computer (PC) market has fueled a corresponding growth in the need for uninterruptible power supplies (UPS's) to back up the utility and prevent loss of data. This paper presents a new off-line UPS design suitable for PC backup applications. It is based on a novel isolated ac/dc converter derived from the integration of a nonisolated buck-boost ac/dc converter with an isolated bidirectional dual active bridge dc/dc converter. The features of the design include input powerfactor correction, a single high-frequency transformer for charging and backup, simple control, inherent current limiting, low switch voltage stresses, and zero-voltage switching of the switches over a wide operating range. The UPS output voltage is trapezoidal in shape and the transition slope can be set such that the output current crest factor is close to unity provided the values of the line filter capacitors of the PC are known.Index Terms-Bidirectional single transformer, power-factor correction, trapezoidal voltage, , uninterruptible power supply, zero-voltage switching.

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Section: B Dab Dc/dc Convertermentioning

confidence: 99%

A new power-factor-corrected single-transformer UPS design

Morrison

Egan

2000

IEEE Trans. on Ind. Applicat.

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“…In the secondary side of the inverter, shown in Figure 3, Vlink is the square wave generated by the input stage converter and the load is grid-connected. It was thought that such an AC-AC converter requires complicated control and modulation [26][27][28][29][30][31][32][33] and generated significant harmonic distortion. However, it was previously shown that thyristors could be used in this topology along with a PWM method to produce high-quality current waveforms with natural current commutation to reduce losses instead of requiring hard-switched IGBT or MOSFETS [6].…”

Section: Introductionmentioning

confidence: 99%

Commutation technique for high frequency link inverter without operational limitations and dead time

Kim

Balog

2016

2016 IEEE Energy Conversion Congress and Exposition (ECCE)

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An improved commutation technique for the ac-ac output converter circuit of a pulse width modulated high frequency link (HF-link) inverter has been investigated. The high frequency link inverter converts a DC input voltage into line frequency AC output voltage using a high-frequency transformer for voltage step-up and galvanic isolation, without an intermediate rectification and DC bus. In this topology, there is a direct ac-ac converter, which processes the HF-link square-wave voltage into the desired sinusoidal ac output voltage. To do this requires a commutation method to prevent shoot-through when output current changes direction or commutates from one switch to the next. Conventionally, dead time is used but this adds distortion to the output waveform. Previously a commutation technique without dead time was introduced, but it required a number of assumptions on the inverter load impedance and link voltage characteristics that made it useful for a stand-alone R-L load but not practical for grid connection. The commutation method in this paper does not require dead time and does not impose any limitation on the output inductance and link voltage magnitude and frequency. Simulations, results experimental results and detailed analysis of output current THD values are presented. I also would like to express my gratitude to my colleagues in the Renewable Energy And Power Electronics Research Laboratory at Texas A&M University for their help, supports, advice and being good friends with me for the entire time during my study. iv CONTRIBUTORS AND FUNDING SOURCES This work was supervised by a thesis committee consisting of Professor Balog and Professor Bhattacharyya of the Department of Electrical and Computer Engineering,

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A new single transformer, power factor corrected UPS design

Morrison

Egan

APEC '98 Thirteenth Annual Applied Power Electronics Conference and Exposition

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A soft commutation constant high frequency link DC/AC converter operating with sinusoidal output voltage

Cited by 6 publications

References 2 publications

A new power-factor-corrected single-transformer UPS design

A new power-factor-corrected single-transformer UPS design

Commutation technique for high frequency link inverter without operational limitations and dead time

A new single transformer, power factor corrected UPS design

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